JP3461690B2 - Motor press machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor press machine, and more particularly to a motor press machine that enables press working with a normal stroke and mold opening when exchanging a working die.

[0002]

2. Description of the Related Art In a motor press machine using a crank press, the bottom dead center position of a press ram is adjusted so that a predetermined machining accuracy can be obtained when a machining die is replaced. As a method of adjusting the bottom dead center position, etc., the vertical movement shaft and the slide are connected with a screw, and the vertical movement shaft is rotated with respect to the slide so that the height of the slide is screwed (special feature). (Kaihei 5-123900 gazette), in which the eccentric position of the crankshaft is made movable and adjusted by the amount of eccentricity (Japanese Patent Laid-Open No. 3-216296), and the fulcrum position of the rocker arm for pushing the ram is changed. There is a method of adjusting the temperature (Japanese Patent Laid-Open No. 4-157098).

Further, in the case where the working die is replaced by a general press, after removing the upper die from the press ram, the press ram is moved to the upper position so as not to disturb the work, and the die is replaced. To do so. In a motor press, the stroke range of the press ram is determined by the range of movement of the eccentric shaft of the crank. Therefore, the stroke range is set to be relatively wide, and when the mold is replaced, the press ram is moved to the uppermost position for work.

However, in these conventional motor press machines, the stroke range during processing is set as the stroke range required for processing, and therefore the mold cannot be easily opened during replacement of the mold or maintenance work. Further, even when the bottom dead center position of the press ram is finely adjusted, the adjustment range is narrow and the adjustment operation is not easy.
Another problem with using a motor press machine is that if a trouble such as a feed error of the work piece that damages the die occurs during the press work, the press machine should be stopped immediately. However, there is a problem in that it is impossible to completely prevent damage to the mold and the like. That is, if a trouble occurs during processing work, the pressing device is immediately stopped to avoid the problem, but it may not be possible to stop instantly due to inertia of the press ram or the like. . In addition, it took a long time to restore after the jamming because it was not possible to fix it by putting a hand between the dies during the restoration.

Therefore, the applicant of the present application has developed a motor press machine disclosed in Japanese Patent Laid-Open No. 8-150499 in order to solve these problems. As shown in FIGS. 7 and 8, this motor press machine is a motor press machine in which a press ram 14 is connected to a crank 20 which is rotationally driven by a motor to reciprocate the press ram 14 in the vertical direction. A rocking link 26 is rockably supported by a supporting shaft 24 that is pivotally supported by a casing 12 arranged on the plate 10. Then, the crankshaft 22 which is a support shaft of the crank 20 is supported on one end side of the swing link 26. Then, the air cylinder 30 is provided on the other end side of the swing link 26, which sandwiches the support shaft 24.
Drive rod 32 is engaged.

In the air cylinder 30, the drive rod 32 is extended upward as shown in FIG. 7 during a normal press work, and the crankshaft 22, the support shaft 24, and the press ram 14 are oscillated in a substantially straight line in the vertical direction. The position of the motion link 26 is defined. The air cylinder 30 is rotatably supported on the casing 12 by a shaft 34. In this state, one end side of the swing link 26 is located at a position further wrapping around to the left side in FIG. 7 rather than vertically downward, and is in contact with the stopper 36 attached to the casing portion 12. When the crank 20 rotates about the crank shaft 22, the upper end is connected to the eccentric shaft 20 a provided on the crank 20, and the lower end is connected to the press ram 14 via the connecting rod 18 connected to the press ram 14.
Moves up and down, and press operation is performed. Also, the adjustment knob 3
The position of the bottom dead center of the press ram 14 can be adjusted by adjusting the protrusion amount of the stopper 36 by using 8.

Further, in the event of a recovery operation after jamming or an emergency during processing, etc., as shown in FIG. 8, the drive rod 32 of the air cylinder 30 is pulled in and the swing link 26 is rotated counterclockwise. To move. As a result, the press ram 14 can be pulled up to a position above the normal press working position, and the press ram 14 can be moved to the retracted position.

[0008]

However, in this motor press machine, the crankshaft 22, the support shaft 24, and the press ram 14 are substantially straight in the vertical direction as shown in FIG. There is a problem in that the section 12 becomes high, and the overall height of the motor press machine and eventually the press machine itself becomes large. Further, when the press ram 14 is moved up to the retracted position when the press ram 14 is moved to the retracted position during jamming or the like, when the press ram 14 is pulled upward through the connecting rod 18, the rocking link 26 and the connecting rod 18 swing. The crankshaft 22 connecting with the link 26 moves upward from a substantially vertical position in an arcuate locus, but when the press ram 14 is pulled up to some extent, the connecting rod 18 becomes lateral as shown in FIG. As a result, the connecting rod 18 is pulled up from the lateral direction, and a large force is required for pulling up. Therefore, a large air cylinder 30 is required, which also causes a problem that the press machine becomes large.

In addition, when jamming or the like occurs due to a feeding error of the workpiece during the pressing work, the press ram 1
Although a large force is applied to No. 4, the swing link 26 is located at a position slightly wrapping around vertically downward as described above, and its rotation is restricted by the stopper 36 during the pressing work, so that there is no escape area for the force. Without mold (punch or die)
There is also a problem that troubles such as damage to the press and the drive mechanism occur.

The present invention has been made to solve the problems in these conventional motor press machines, and the purpose thereof is to efficiently perform press work by a normal stroke and to restore a die after jamming. An object of the present invention is to provide a motor press machine that can be easily opened, can reduce the overall height of the motor press machine, and can prevent damage to the mold even when jamming or the like occurs.

[0011]

The present invention has the following constitution in order to achieve the above object. That is, a support base, an intermediate portion of which is attached to the support base by a support shaft, and a swing link which is swingable about the support shaft, and a crank shaft, which is a support shaft, rotates at one end of the swing link. A freely supported crank, a press ram that is connected to the crank and reciprocates in the vertical direction when the crank is rotationally driven, and is connected to the other end of the swing link, and is centered on the support shaft. In a motor press having a drive unit that swings a swing link to move the press ram in the vertical direction, the drive unit is rotatably connected to the other end of the swing link by a first shaft. a first link member has, pivotally connected to the second shaft to the first link member, and a second link member which is rotatably connected by the third shaft lower end to said support base, said first Connected to 2 axes, And rotating means for rotating the click member around the <br/> third axis, wherein provided on the supporting base, the press ram direction of the first link member or the second link member and the contact with the second link member Is provided with a stopper mechanism for restricting the rotation of the second link member in the press ram direction during the pressing operation so that the first link member or the second link member contacts the stopper mechanism. The height position on one end side of the swing link is defined so that the support shaft is located on a first straight line that is in contact with and extends laterally from the crank shaft, and the second position is used for recovery work after jamming and for other emergencies. The other end side of the swing link is lowered by rotating the link material in the direction opposite to the press ram, and the press ram is moved upward to the retracted position above the press work. In this way, the rotating means rotates the second link member in the press ram direction to bring the first link member or the second link member into contact with the stopper mechanism and to move the first link member or the second link member on the first straight line extending laterally from the crankshaft. Since the press work can be performed by defining the height position on one end side of the swing link so that the support shaft is located, it is possible to perform a motor press as compared with the conventional case where the swing link is vertically arranged above the press ram. The overall height of the machine can be lowered. Further, in the case of recovery work after jamming or in other emergency, by rotating the second link member in the direction opposite to the press ram, the other end side of the swing link can be lowered, and the press ram can be pulled up almost directly to the retracted position. Therefore, the pulling can be performed more efficiently than the conventional pulling from the lateral direction.

Further, the rotating means is provided at the front during the press work.
By rotating the second link material in the press ram direction,
The two axes are better than the second straight line connecting the first and third axes.
The first link member or
When the second link member is brought into contact with the stopper mechanism,
After recovery work, the second link material is
Rotate in the wrestling direction to move the second straight line to the second line.
The shaft is moved to the side opposite the press ram
The repulsive force that the press ram receives during press work is
The first link material or the second link material is always the stopper mechanism.
Since it acts in the direction of abutting against, it is possible to prevent the swing link from swinging.

Further, if the stopper mechanism is configured to contact the lower side of the second shaft of the first link member or the upper side of the second shaft of the second link member, the stopper is a swing link. It is possible to reduce the force received from the press ram via the, and the stopper can be downsized.

The stopper mechanism rotates the second link material in the press ram direction when the force received from the abutting first link material or second link material exceeds a preset magnitude. With such a configuration, even when a large force is applied to the press ram 14 due to a feeding error of the work piece during the press work and the press ram 14 receives a large force, the stopper can absorb the force. It can prevent machine damage. Further, specifically, the stopper mechanism includes a stopper body that is movable along the moving direction of the second shaft, an urging member that constantly urges the stopper body in a direction away from the press ram, and the stopper. The stopper member comes into contact with the body and regulates the movement of the stopper body in the second axial direction. Further, at this time, in the stopper, the regulating position of the stopper body by the regulating member is adjusted, and the amount of rotation of the first link material or the second link material in the press ram direction is adjusted, thereby performing the pressing operation. It is preferable to provide an adjusting mechanism for finely adjusting the bottom dead center position of the press ram.

[0015]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.
1 to 3 are explanatory views showing a configuration and an operation of a main part of a motor press machine according to the present invention. In the figure, reference numeral 40 is a support base of the motor press machine, and 42 is a casing portion for housing the motor press machine. The press ram 14 is guided by a cylindrical slide guide 16 attached to a through hole 40 b provided on the bottom surface 40 a of the support base 40, and the support base 4
It extends downward from the lower surface of 0. Slide guide 1
A bush impregnated with oil is attached to a portion of the No. 6 contacting the press ram 14 so that the press ram 14 can move smoothly. Further, as shown in FIG. 1 and FIG. 5, a plurality of ribs 40c are formed on the bottom surface 40a of the support base 40 to which the slide guide 16 is attached and are reinforced. Both are configured to ensure sufficient strength.

The connecting rod 18 is a press ram 1.
4 and the crank 20 are connected. The connecting rod 18 has a shaft 14 provided at the upper end of the press ram 14 at both ends thereof.
a and an eccentric shaft 20a of the crank 20 respectively support the rotary motion of the crank 20 into a vertical motion of the press ram 14. The vertical stroke of the press ram 14 is defined by the rotational stroke range of the eccentric shaft 20a.
The crank shaft 22 of the crank 20 is rotatably attached to one end side (the right end in FIG. 1) of the swing link 26, is connected to the output shaft 44a of the electric motor 44, and is rotationally driven.

Conventionally, an ordinary electric motor (induction motor or the like) was used for this electric motor, but in the present embodiment, a servo motor (DC servo motor, AC servo motor or the like) is used for the electric motor 44. is doing. By using the servo motor, the rotation can be instantaneously stopped without providing a brake mechanism for stopping the rotation of the electric motor, which was conventionally required, and the mechanism can be simplified. Also, when two motor press machines are installed side by side, or in the case of a two-head press machine having two press mechanisms,
When an electric motor as in the prior art is used, the two press mechanisms and the workpiece feed mechanism are operated in synchronization with each other while detecting the respective operation timings with sensors or the like. Therefore, it is difficult to operate at high speed as a whole. However, by using a servo motor, it becomes possible to perform the operation timing of each press mechanism at a predetermined timing and also the feed mechanism at a predetermined timing according to the operation of each press mechanism. Therefore, it is not necessary to operate the other mechanism while watching the operation of one mechanism, and the operation speed of the entire device is increased.

The support shaft 24 is horizontally installed on the support base 40, and the swing link 26 is rotatably attached to the support base 40 by the support shaft 24 at a middle portion thereof. Can swing freely. The swinging link 26 is replaced with the conventional L-shaped one instead of the crankshaft 22, the support shaft 24,
A first shaft, which will be described later, is formed into a linear outer shape so as to form a substantially straight line, and is attached so as to be lateral to the vertical direction that is the reciprocating direction of the press ram 14.
In the state during the press work shown in (1), the crankshaft 22 and the support shaft 24 are located on the substantially horizontal first straight line A. Compared with the conventional example in which the swing link 26 is erected above the press ram 14, the swing link 26 is disposed above the press ram 14 in a horizontal shape, that is, in a lateral direction, as compared with the conventional example. , The overall height of the motor press can be minimized. In addition, the crankshaft 22 and the press ram 1
The positional relationship of No. 4 will be described.
The locus of the crankshaft 22 draws an arc when it swings about 4, but when the center line of the press ram 14 is extended, it has a relationship of being in contact with the arc.

FIG. 3 shows a sectional view of the swing link 26 and the crankshaft 22 as seen from the front direction (right direction in FIG. 1). As shown in FIG. 6, the swing link 26 includes a pair of support arms 2
6a are integrally connected to each other with a space provided therebetween, the crank 20 is sandwiched between a pair of support arms 26a, and a crank shaft 22 protruding from both side surfaces of the crank 20 is rotatably supported by each support arm 26a. It An eccentric shaft 20a formed at the center of the crank 20 is rotatably inserted into the upper end of the connecting rod 18, and an upper end of the press ram 14 is rotatably attached to the lower end by a shaft 14a.

A first pulley 46 for transmitting a rotational force to the crank 20 is arranged on the outer surface of one supporting arm 26a of the swinging link 26 so as to be connected to the crankshaft 22. Here, an outline of a drive system for vertically moving the press ram 14 will be described. As shown in FIG. 6, the second pulleys 48a, 48b are also provided at both ends of the support shaft 24 horizontally installed on the support base 40. Are connected. Further, an electric motor 44 is arranged on the opposite side of the crank 20 with the support shaft 24 interposed therebetween, and the third pulley 50 is provided on the output shaft 44a thereof.
Are connected. The belts 52a and 52b are stretched between the first pulley 46 and the second pulley 48a and between the second pulley 48b and the third pulley 50,
The driving force of the electric motor 44 is transmitted to the first pulley 46,
The crank 20 rotates. The rotation of the crank 20 causes the press ram 14 to move up and down.

In FIG. 1, the drive unit 5 is provided at the tip end on the other end side (left end side) of the swinging link 26 which is laid down in a substantially horizontal direction.
4 are connected. The drive unit 54 is the swing link 26.
Is swung around the support shaft 24 to move the press ram 14 in the vertical direction. The drive unit 54 is configured to move the crankshaft 22 with respect to the moving direction of the press ram 14 during normal press work.
The position of the rocking link 26 is defined so that the support shaft 24 is located on the first straight line A extending laterally from the rocking link 26 in the event of a recovery operation after jamming or an emergency during processing. It has a function of lowering the other end side to rotate the swinging link 26 in the counterclockwise direction to move the press ram 14 to a retracted position which is higher than in the normal press work.

The detailed structure of the drive unit 54 will be described. The drive unit 54 may be constituted by the air cylinder 30 as in the conventional example, and the drive rod 32 thereof may be directly connected to the other end side of the swing link 26 to swing the swing link 26. In the embodiment, as shown in FIG. 1, instead of directly swinging the swinging link 26 with the air cylinder 30, a configuration is used in which the swinging link 26 is swung through two links. That is, the drive unit 54 includes the first link member 58 whose upper end side is rotatably connected to the other end side of the swing link 26 by the first shaft 56, and the first link member 5.
The upper end side is rotatably connected to the lower end side of 8 by a second shaft 60, and the lower end side is rotated by a third shaft 62 to a predetermined portion of the support base 40 located below the other end side of the swing link 26. The second link member 64 and the second link member 6 that are freely connected
4 is configured to rotate about the third shaft 62 (as an example, the air cylinder 30). Further, a stopper mechanism 66 provided on the support base 40 is provided so as to come into contact with the first link material 58 or the second link material 64 and regulate the rotation of the second link material 64 in the press ram 14 direction. In the present embodiment, as an example, the first link member 5
Although the stopper mechanism 66 abuts on the lower end of 8, the stopper mechanism 66 may abut on the upper end of the second link member 64 instead.

As shown in FIG. 4, one end of the air cylinder 30 is rotatably attached to the support base 40 by the shaft 34, and the tip of the drive rod 32 is rotatably connected to the second shaft 60. During the press work, the drive rod 32 of the air cylinder 30 contracts, the second link member 64 is rotated in the direction of the press ram 14, and the second shaft 60 is moved to the first shaft 56.
And a second straight line B connecting the third shaft 62 and the press ram 1
Move to 4 side. In this case, the lower end of the first link member 58 comes into contact with the stopper mechanism 66 so that the second link member 64 is
However, the air cylinder 30 continues to urge the second link member 64 in the same direction. At this time,
And the first link member 58 and the second link member 6 as shown in FIG.
Since 4 is bent in a V shape toward the press ram 14, when the repulsive force applied to the press ram 14 during the press work is applied to the first link member 58 and the second link member 64 via the swing link 26. However, the acting direction of the force is always the direction in which the second link member 64 is rotated in the direction of the press ram 14, so that the first link member 58 always receives the moving force in the direction of contacting the stopper mechanism 66. It is possible to reliably prevent the swing link 26 from rotating counterclockwise.

The stopper mechanism 66 has a function of reliably holding the swinging link 26 horizontally during the pressing work as described above, and by changing the contact position with the first link member 58, Swing link 26 by mechanism 66
There is also an effect of adjusting the bottom dead center position of the press ram 14 by slightly changing the regulation position of. Further, the stopper mechanism 66 of the present embodiment, when the force received from the abutting first link material 58 or the second link material 64 exceeds a preset magnitude (set value), the second link material There is also an effect of permitting rotation of the 64 in the press ram direction. Due to this action, the jamming or the like due to a feed error of the work piece during the pressing work occurs, and even when a large force equal to or larger than the set value is applied to the press ram 14, the second link member 64 that has been restricted in rotation until then. The force can be absorbed by further rotating the mold, and damage to the mold and the press can be prevented.

A specific structure of the stopper mechanism 66 will be described with reference to FIGS. 4 and 5. The stopper body 68 is the first
The link member 58 (or the second link member 64) directly contacts. As an example, the stopper body 68 has a rod-shaped outer shape, one end (the lower end in FIG. 5) is pivotally supported on the wall surface of the support base 40 by a shaft 68a, and is rotatably attached in a horizontal plane. On the side surface in the (second link material 64) direction, an abutting portion 68b that abuts on one side surface of the first link material 58 or the second link material 64 is provided.
When the stopper body 68 rotates, the contact portion 68b provided on the side surface moves in an arc shape along the moving direction of the second shaft 60 (direction of arrow C in FIG. 5). The restricting member 70 contacts the stopper body 68 and restricts the movement of the stopper body 68 in the direction of the second axis 60, and is formed in a rod shape as an example, and has one end (the left end in FIG. 4, FIG. 5). (The right end of FIG. 4) is screwed to the support base 40, and the other end (the right end in FIG. 4, the left end in FIG. 5)
Is attached to the support base 40 so as to pass through the end of the stopper body 68 that freely rotates. The regulation member 70 is arranged along the longitudinal direction of the swing link 26. Further, a first large diameter portion 70a is formed at the other end of the regulating member 70 penetrating and protruding through the stopper body 68, and a second large diameter portion 70a is sandwiched by the second large diameter portion 70a. The diameter portion 70b is formed. Therefore, the free end portion side of the stopper body 68 is movable between the first large diameter portion 70a and the second large diameter portion 70b.

Further, between the free end side of the stopper body 68 and the second large diameter portion 70b, the stopper body 68 is always urged in the direction away from the press ram 14 with the second large diameter portion 70b as a reference. Coil spring 7 as a biasing member for
2 is attached to the regulation member 70 so as to be fitted onto the regulation member 70. The urging force of the coil spring 72 can be arbitrarily set depending on the diameter and material of the wire rod and the degree of contraction at the time of insertion. Instead of the coil spring 72, it is possible to use a wound spring or a leaf spring for fishing. Since one end of the regulation member 70 is screwed to the support base 40, the first large diameter portion 7 is rotated by rotating the regulation member 70.
The position along the longitudinal direction of the regulating member 70 of 0a can be changed. As a result, the coil spring 72 is always
The position of the stopper body 68, which is urged to come into contact with the first large-diameter portion 70a, can also be changed by means of the
Since the regulation position of the swing link 26 due to is also changed,
The bottom dead center position of the press ram 14 can be adjusted.

Further, the stopper mechanism 66 of the present embodiment.
Then, when a force exceeding the urging force of the coil spring 72 is applied from the first link member 58 or the second link member 64 that is in contact with the stopper body 68, the coil spring 7
2 contracts to allow the second link member 64 to rotate in the direction of the press ram 14. Therefore, press ram 14
In consideration of the strength of the die driven by the motor and the strength of the rocking link 26, the first and second link members 58, 64, etc. that compose the motor press, the biasing force of the coil spring 72 is set to a predetermined set value in advance. By doing so, even if a jamming or the like occurs due to a feed error of the work piece during the press work and a large force equal to or larger than the set value is applied to the press ram 14, the second link member 64 that has been restricted in rotation until then. The force can be absorbed by further rotating the mold, and damage to the mold and the press can be prevented. Reference numeral 74 denotes an adjustment knob attached to one end of the regulation member 70. By manually rotating the adjustment knob 74, the regulation member 70 moves back and forth along the longitudinal direction. The rotation of the regulating member 70 may be performed by an electric motor or the like instead of being manually performed.
It is also possible to provide a load cell therein, detect the pressure applied to the press ram 14 by this load cell, and drive the electric motor to automate the adjustment of the bottom dead center position of the press ram 14.

Further, in the present embodiment, the lower end side of the first link member 58 is formed so as to extend further below the second shaft 60, and the stopper mechanism 66 is formed from the second shaft 60 of the first link member 58. It is configured to come into contact with the lower part. Therefore, compared with the case where the vicinity of the second shaft 60 directly contacts the stopper mechanism 66, the second link member 6 is applied with a small force by the lever principle.
It is possible to prevent the rotation of the rocking link 26 by restricting the rotation of the No. 4 rotation. Therefore, the small coil spring 72
In addition, the stopper mechanism 66 and the entire press machine can be downsized. Note that instead of this configuration, the second
The upper end side of the link member 64 is formed so as to extend further upward than the second shaft 60, and the stopper mechanism 66 serves as the second link member 64.
The same applies to a configuration in which the above-mentioned second shaft 60 comes into contact with a portion above the second shaft 60.

1 and 4 (viewed from the side opposite to FIG. 1) show the press ram 14 with the swing link 26 in the down position.
It is in a state where normal press work is performed. FIG. 3 shows how the press ram 14 is driven up and down. That is, it shows a state in which the press ram 14 is in a lowered position from the center line to the left half and a state in which the press ram 14 is raised to the right half. The press ram 14 is vertically driven by rotating the crank 20 by the motor 44 via the drive system.

FIG. 2 shows another usage state of the motor press machine, in which the press ram 14 is moved to a position higher than the stroke range position during normal work.
In this way, the press ram 14 is moved to the upper position when some trouble occurs during normal work and the press work must be stopped instantaneously, or when the press ram 14 is restored after jamming. It is used when you want to move to a position that does not interfere with work.

For example, in the case where a trouble such as a feed error of the work piece which damages the die occurs during the pressing work, the air cylinder 3 is used in the apparatus of this embodiment.
The press ram 14 can be moved to the retracted position by pulling up the press ram 14 to a position higher than the normal working position by instantaneously operating 0 to rotate the swing link 26 counterclockwise. The press ram 14 has a constant inertia, but by forcibly moving it in the direction away from the work position as in the present embodiment, it becomes possible to instantly perform an appropriate retracting operation against the inertial force.

Further, moving the press ram 14 to a position higher than the normal working position as in the apparatus of the present embodiment has an advantage of facilitating work at the time of restoration work after jamming. is there. Particularly, in the device of the present embodiment, the operation of setting the press ram 14 at the upper retracted position can be completed by the pivotal movement of the swing link 26 by the air cylinder 30, and therefore the operation is simple and the movement of the press ram 14 is also possible. It can be done immediately and is easy to handle. Further, it is extremely easy and quick to set the press ram 14 to a position in a normal working state after working.

Here, in order to move the press ram 14 above the normal working position, the drive rod 32 of the air cylinder 30 is projected (projected to the position shown by the dotted line in FIG. 4), and the second link member 64 is moved. Is rotated in the direction opposite to the press ram 14 so that the second shaft 60 crosses the second straight line B and the press ram 1
Move to the opposite side of 4. In this case, the second link member 6
When 4 rotates by a predetermined angle or more, the other end side of the swing link 26 is pulled down via the first link member 58, so that one end side of the swing link 26 moves upward, whereby the press ram 14 becomes normal. It is moved to a retracted position above that during pressing. In the present embodiment, as described above, since the extension line of the center line of the press ram 14 is in contact with the arc drawn by the crank shaft 22 when the swing link 26 swings about the support shaft 24, the restoration is restored. At the time of work or the like, since the swing link 26 can be rotated and the press ram 14 can be pulled up substantially right up to the retracted position, compared with the conventional configuration in which the press ram 14 is pulled up from the lateral direction, the slide guide 16 can be used. The resistance between them becomes small, and efficient lifting is possible. Therefore, the air cylinder 30 included in the drive unit 54 may be smaller than that of the conventional example, and the press machine can be downsized. The operation of rotating the swing link 26 can be performed after stopping the crank rotation during the press work, or can be performed without stopping the crank rotation.

[0034]

According to the motor press of the present invention,
Efficient press working with normal stroke and easy mold opening at the time of restoration after jamming, and because the swing link is placed in a horizontal position with respect to the press ram that reciprocates in the vertical direction, The overall height of the motor press can be made lower than in the case where the swing link is vertically arranged above the press ram as described above. In addition, since the swing link can be rotated to raise the press ram almost directly to the retreat position during restoration work after jamming,
The pulling can be performed more efficiently than the conventional pulling from the lateral direction. Therefore, the driving unit can be downsized, which in turn leads to downsizing of the entire press machine. The stopper mechanism allows the second link material to rotate in the press ram direction when the force received from the abutting first link material or the second link material exceeds a preset magnitude. Even if a large force is applied to the press ram due to a feed error of the work piece during the press work and the press ram receives a large force, the stopper can absorb the force and damage the drive mechanism of the die press and press machine. It has the remarkable effect of being able to prevent

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of each part of a motor pressing machine in a processing state by a normal stroke.

FIG. 2 is an explanatory diagram showing a configuration of each part in a state in which a press ram is moved to an upper retracted position by a motor press machine.

FIG. 3 is a front explanatory view showing an operation of the press ram in a working state with a normal stroke.

FIG. 4 is an explanatory view of FIG. 1 viewed from the back side.

FIG. 5 is an explanatory diagram showing a planar arrangement in which a swinging link is removed in order to explain a stopper mechanism.

FIG. 6 is an explanatory view showing a planar arrangement of a crank attached to a swing link, a support shaft, and a first shaft.

FIG. 7 is an explanatory diagram showing a configuration of each part of a conventional motor press machine in a processing state by a normal stroke.

FIG. 8 is an explanatory diagram showing a configuration of each part in a state in which a press ram is moved to an upper retracted position in a conventional motor press machine.

[Explanation of symbols]

14 Press Rum 18 connecting rod 20 cranks 22 crankshaft 24 Support shaft 26 swing links 40 support 44 motor 54 Drive 56 1st axis 58 1st link material 60 Second axis 62 Third axis 64 Second link material 66 Stopper mechanism 68 Stopper body 68b contact part A first straight line

Claims (6)

(57) [Claims] 1. A support base, a swing link having a midway portion attached to the support base by a support shaft, and swingable about the support shaft, and a crank serving as a support shaft on one end side of the swing link. A crank whose shaft is rotatably supported, a press ram that is connected to the crank, and reciprocates in the vertical direction when the crank is rotationally driven, and a support shaft that is connected to the other end of the swing link. In a motor press machine having a drive unit for moving the press ram in the up-down direction by swinging a swing link around the center, the drive unit is rotatable by a first shaft on the other end side of the swing link. A first link member connected to the first link member, and a second link member rotatably connected to the first link member by a second shaft, and a lower end side rotatably connected to the support base by a third shaft. , Connected to the second shaft, Rotation means for rotating the second link member about the third axis, and the first link member or the second link member provided on the support base.
A stopper mechanism is provided for contacting the link material and restricting rotation of the second link material in the press ram direction, and the rotating means rotates the second link material in the press ram direction during a pressing operation. 1 link material or 2nd
The height position on one end side of the swing link is regulated so that the support shaft is located on the first straight line extending laterally from the crank shaft by bringing the link member into contact with the stopper mechanism, and after the jamming, In the case of recovery work or other emergencies, the second link member is rotated in the direction opposite to the press ram to lower the other end of the swing link to move the press ram to a retracted position above the press work. Motor press machine. 2. The rotating means rotates the second link member in the press ram direction during a pressing operation, so that the second shaft is more than the second straight line connecting the first shaft and the third shaft. Moved to the press ram side and bent the first link material or the second link material.
When the link member is brought into contact with the stopper mechanism and the second link member is rotated in the direction opposite to the press ram in the case of recovery work after jamming or in other emergency, the second shaft is moved to the side opposite to the press ram with respect to the second straight line. The motor press machine according to claim 1, wherein the motor press machine is moved to a bent state. 3. The stopper mechanism contacts the lower side of the second shaft of the first link member or the upper side of the second shaft of the second link member.
Alternatively, the motor press machine described in 2. 4. The stopper mechanism includes the first contacting member.
3. When the force received from the link material or the second link material exceeds a preset magnitude, rotation of the second link material in the press ram direction is allowed. 3. The motor press machine according to any one of 3. 5. The stopper mechanism includes a stopper body that is movable along the moving direction of the second shaft, a biasing member that constantly biases the stopper body in a direction away from the press ram, and the stopper body. The motor pressing machine according to any one of claims 1, 2, 3 and 4, wherein the motor pressing machine comprises a regulating member that abuts against the stopper body to regulate the movement of the stopper body in the second axial direction. 6. The stopper mechanism adjusts a restriction position of the stopper body by the restriction member, and adjusts a rotation amount of the first link material or the second link material in a press ram direction during press work. 6. The motor pressing machine according to claim 5, further comprising an adjusting mechanism for finely adjusting a bottom dead center position of the press ram in the.